Date: Fri, 7 Apr 1995 08:21:30 -0500 (GMT-0500) From: "Serge A. Babkin" <babkin@hq.icb.chel.su> To: terry@cs.weber.edu (Terry Lambert) Cc: freebsd-hackers@FreeBSD.org Subject: Re: large filesystems/multiple disks [RAID] Message-ID: <199504071321.IAA00249@hq.icb.chel.su> In-Reply-To: <9504061615.AA12169@cs.weber.edu> from "Terry Lambert" at Apr 6, 95 10:15:50 am
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> > How about disk mirroring ? If you have a _mirrored_ database on two 2G > > disks and then add 2x2G (or may be 1x4G) and get spanned mirrored database. > > You get reliability due to mirroring and easy expansion due to spanning. > > That works... but then again, it's an additional support change to > increase reliability. > Note that a procedural change could suffice... like adding regular > backups when there were none before. Yes. But mirroring gives additional throughput increase for reading like stripping (and decrease for writing unlike it :-( ). But from my experience big databases are much more often read than written, aren't they ? Serge Babkin ! (babkin@hq.icb.chel.su) ! Headquarter of Joint Stock Bank "Chelindbank" ! Chelyabinsk, Russia
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